Synthetic oil for I-5s

[Jim Green]

--- David <duandcc_forums at cox.net> wrote:
> I've been running 20W50 dino oil in my CGT and doing
> MMO treatments before oil changes. I was thinking of
> switching to synthetic for it's cleaning properties
> and to help keep oil temps down (in high
> speed/agressive driving on the highway my oil temp
> goes as high as 150*C, cruising is around 130*C and
> in town around 90-100*C). I realize there is a
> chance that the synthetic will clean out the engine
> so well that it will begin to leak or burn oil. My
> plan was to switch to synthetic for 6 months or so
> to clean it out then switch back if it leaks or
> consumes oil. So, what are your thoughts on this?
> What weight is appropriate for I5s? Is it available
> in 20W50? Do I even need it that thick with
> synthetic?

My car loves the 15w50 mobil 1 in the summer, I run
10w30 in the really cold winter months.  If you drive
really hard like you say, you might think about
fitting an oil cooler.  Just grab the oil filter
bracket and cooler from one of the turbo cars, or you
can use an aftermarket one like below.
http://www.mswanson.com/~jgreen/stage1/oil_cooler.html

I switched mine to syn at 108k and had no problems.  I
think if you kept your engine in good shape like you
say you'll be fine.  It's the ones that you can scrape
the goo off the cam caps that you have to worry about.

HTH,

=====
Jim Green
'89 90tq 034EFI Stage II
http://www.mswanson.com/~jgreen/car_home.html

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